If you've got a lot of them on your property, apparently the latest recommendation is to trap them, rather than employing a sticky band as previously recommended (too much collateral damage?) Here's how to build one:
How to Build a New Style Spotted Lanternfly Circle Trap. (This comes from the PennState Extension, which is considered the leading authority, I believe, at this time.)
As for larger scale, I haven't yet heard about spraying being employed as has been done for Gypsy moth/Spongy moth (although I haven't looked into that specifically). However, I do know Harpers Ferry National Historical Park (which covers more than 3,600 acres in West Virginia, Maryland, and Virginia) is undertaking a multi-year project to greatly reduce the number of Spotted Lanternfly host trees (Tree-of-Heaven/Ailanthus altissima) in the park. I think the goal is to eventually reduce the number of trees by 80%.
One thing I haven't yet learned is how much removing Tree-of-Heaven impacts the Spotted Lanternfly population. The lanternfly will feed on over 70 different other plant species even if Tree-of-Heaven is preferred. Regardless, controlling the highly invasive exotic Tree-of-Heaven is definitely worthwhile as it "produces an overly abundant amount of seeds, crowds out native species with its dense thickets and secretes a chemical into the soil that is toxic to surrounding plants" according to one source.